/*
 * Copyright (c)2019 ZeroTier, Inc.
 *
 * Use of this software is governed by the Business Source License included
 * in the LICENSE.TXT file in the project's root directory.
 *
 * Change Date: 2025-01-01
 *
 * On the date above, in accordance with the Business Source License, use
 * of this software will be governed by version 2.0 of the Apache License.
 */
/****/

#ifndef ZT_NETWORKCONFIGMASTER_HPP
#define ZT_NETWORKCONFIGMASTER_HPP

#include <stdint.h>

#include "Constants.hpp"
#include "Dictionary.hpp"
#include "NetworkConfig.hpp"
#include "Revocation.hpp"
#include "Address.hpp"

namespace ZeroTier {

class Identity;
struct InetAddress;

/**
 * Interface for network controller implementations
 */
class NetworkController
{
public:
	enum ErrorCode
	{
		NC_ERROR_NONE = 0,
		NC_ERROR_OBJECT_NOT_FOUND = 1,
		NC_ERROR_ACCESS_DENIED = 2,
		NC_ERROR_INTERNAL_SERVER_ERROR = 3,
		NC_ERROR_AUTHENTICATION_REQUIRED = 4
	};

	/**
	 * Interface for sender used to send pushes and replies
	 */
	class Sender
	{
	public:
		/**
		 * Send a configuration to a remote peer
		 *
		 * @param nwid Network ID
		 * @param requestPacketId Request packet ID to send OK(NETWORK_CONFIG_REQUEST) or 0 to send NETWORK_CONFIG (push)
		 * @param destination Destination peer Address
		 * @param nc Network configuration to send
		 * @param sendLegacyFormatConfig If true, send an old-format network config
		 */
		virtual void ncSendConfig(uint64_t nwid,uint64_t requestPacketId,const Address &destination,const NetworkConfig &nc,bool sendLegacyFormatConfig) = 0;

		/**
		 * Send revocation to a node
		 *
		 * @param destination Destination node address
		 * @param rev Revocation to send
		 */
		virtual void ncSendRevocation(const Address &destination,const Revocation &rev) = 0;

		/**
		 * Send a network configuration request error
		 *
		 * If errorData/errorDataSize are provided they must point to a valid serialized
		 * Dictionary containing error data. They can be null/zero if not specified.
		 * 
		 * @param nwid Network ID
		 * @param requestPacketId Request packet ID or 0 if none
		 * @param destination Destination peer Address
		 * @param errorCode Error code
		 * @param errorData Data associated with error or NULL if none
		 * @param errorDataSize Size of errorData in bytes
		 */
		virtual void ncSendError(uint64_t nwid,uint64_t requestPacketId,const Address &destination,NetworkController::ErrorCode errorCode, const void *errorData, unsigned int errorDataSize) = 0;
	};

	NetworkController() {}
	virtual ~NetworkController() {}

	/**
	 * Called when this is added to a Node to initialize and supply info
	 *
	 * @param signingId Identity for signing of network configurations, certs, etc.
	 * @param sender Sender implementation for sending replies or config pushes
	 */
	virtual void init(const Identity &signingId,Sender *sender) = 0;

	/**
	 * Handle a network configuration request
	 *
	 * @param nwid 64-bit network ID
	 * @param fromAddr Originating wire address or null address if packet is not direct (or from self)
	 * @param requestPacketId Packet ID of request packet or 0 if not initiated by remote request
	 * @param identity ZeroTier identity of originating peer
	 * @param metaData Meta-data bundled with request (if any)
	 * @return Returns NETCONF_QUERY_OK if result 'nc' is valid, or an error code on error
	 */
	virtual void request(
		uint64_t nwid,
		const InetAddress &fromAddr,
		uint64_t requestPacketId,
		const Identity &identity,
		const Dictionary<ZT_NETWORKCONFIG_METADATA_DICT_CAPACITY> &metaData) = 0;
};

} // namespace ZeroTier

#endif
